The photo below ran in the May 7, 1939 Chicago Daily Tribune.
What the waitress of the year 2000 may wear. Marjorie Hannon, W-G-N actress, models this costume, designed by the National Restaurant association for exhibit during Restaurant week, May 8 to 14. That metallic hair ribbon is an antenna for ultra shortwave radio which brings patrons' orders directly to tiny earphones concealed beneath her uniform. Pockets contain condiments for those who have time to eat a leisurely meal; concentrated capsules for those who haven't. Asbestos gloves prevent burns from hot plates.